AnagramSnippet.java

/*
 * MIT License
 *
 * Copyright (c) 2017-2022 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package string;

import java.util.Arrays;

/**
 * AnagramSnippet.
 */
public class AnagramSnippet {

  /**
   * Checks if two words are anagrams (contains same characters with same frequency in any order).
   *
   * @param s1 The first string to be checked
   * @param s2 The second string to be checked
   * @return true if they are anagrams of each other
   */
  public static boolean isAnagram(String s1, String s2) {
    var l1 = s1.length();
    var l2 = s2.length();

    if (l1 != l2) {
      return false;
    }

    var arr1 = new int[256];
    var arr2 = new int[256];
    
    for (var i = 0; i < l1; i++) {
      arr1[s1.charAt(i)]++;
      arr2[s2.charAt(i)]++;
    }
    return Arrays.equals(arr1, arr2);
  }
}